Well point



T. G. GRIFFIN WELL POINT March 24, 1936.

Filed Oct. 2, 1934 l Patented Mar. 24, 1936 UNITED STATES' lPA'rlzNr ori-ics 2 Claims.

The inventionhas relation to apparatus for draining water containing, soil, `and particularly to devices commonly known as well'points, of the self jetting type, adapted to jet the soil by water 5 under pressure, whereby the device is gradually sunk in the hole thus formed,land when sunk to the proper depth adapted for withdrawing the -water from the soil by suction, preparatory to construction or other work. Y l0 It is an object of the invention to provide cer- 4tain improvements on. the Adevice of my application for patent Serial Number 738,132, led August 2, 1934, which has resulted in Patent No.

2,011,518, dated August 13, 1935, .to .increasel the drainage capacity and reduce friction of thewater being drained, in its passage throughy the well point, thereby increasing eiliciency. Another object is to increase the stilening, reinforcing and bracing action of the spacers located between the cylindrical ypipe and the outer tubular screen to thereby provide a stronger device. Another object is to adapt the outer tubular screen and said spacers to be formed of a single sheet of perforated metal.

Another object is to avoid necessity of connecting said spacers to said cylindrical pipe. Another ob.

ject is to ,form said spacers collectively into a single unit or element of the wellpoint. Another objectl is to form said outer tubular screen and said spacers into a single unit or element ofthe well point. Other objects and advantages will appear hereinafter.

The invention consists in the novel construction and combinations of parts, as hereinafter set forth in the claims. 1 In the accompanying drawing illustrating the invention, s

Figure 1 is a central vertical section of the well point, partly broken away. 40 Figure 2 is a section on the line 2-2, Figure 1,

and Figure 3 is a detail fragmentary sectional view. In the drawing, the numeral I designates the lower head of the wel-1 point, including a valve seat having threaded connection l with the two heads is a cylindrical pipe I0. Surrounding the pipe I0 and concentric therewith is a tubular cylindrical screen I2, spaced from said pipe by an annular drainage space I3.

The pipe I0, has at the lower end portion only 5 thereof adjacent said valve, a plurality of perforations I4, establishing direct communication for the drainage water from said annular space to the interior of said pipe, said perforations having a total area which is restricted so as not to be 10 too large with respect to the cross-sectional area of the interior of said pipe, and said valve chamber communicating directly with the opening of the lower end of said pipe through said valve seat,

whereby suction applied to the upper head will 15 be conned to the lower end portion of said pipe adjacent said valve and be eiective to close said valve and drawI water being drained through said pipe perforations.

The upper head 9 has connected thereto a riser 20 pipe Il, inone or more sections as required, and extending to the surface of the ground. In'order to space the screen I2 from the cylindrical pipe I0, and to stffen and reinforce the construction,`a longitudinally corr gated pipe I5, 25 is located Within said annular dra nage space I3 between pipe I0 and screen I2, and is provided with alternating hollow ridges and hollow valleys dividing said annularspacc into an inner and outer series of longitudinal drainage chan- 30 nels I5 for the water. The pipe I5 is of such strength due to its corrugated construction that it is adapted to beperforated throughout as in thefcase of the screen I2, without undue sacri'- `fce of 4its bracing and reinforcing action. The 35 perforationsfal of the corrugated pipe I5 establish communication between the drainage `channels `and thet'rerforations` of the cylindrical pipe', and also establish intercommunication be- "tween the drainage channels adapted to maintain 40 between the screen I2 and the`pipe I5, and in case there should be danger of injury to the ne mesh screen and to add strength, an inner tubular screen I9 may be used as a backing for the ne `mesh screen between the same and the corrugated pipe I5.

A portion ofthe water used in the .letting optated.

In the process of manufacture of the screen I2 and the corrugated pipe I5, -a single sheet of perforated metal is adapted to have one portion thereof formed with the longitudinal corrugations, after which the corrugated p ortion maybe rolled around a tubular pipe or former of the same diameter as that of the pipe I0, to produce the corrugated pipe I5, the abutting edge portions being adapted to be secured together at 24 to hold said pipe I5 in form, and nally the balance of said sheet may be rolled around the corrugated pipe to produce the screen I2, the abutting edge portions of which may be secured together at 25 to hold said screen in form, the result being a singleunit or element of the well point. Or the corrugated pipe I5 may be formed as a single unit or element of the Well point, to take the place of the separate spacers commonly employed which are separately secured to the cylindrical pipe.

The manufacture may in this way be much l I5 formed in the initial rolling, the outer tubular screen and the ne mesh tubular screen backing therefor, thus completed maybe secured together at 25, this securing means acting to hold both the outer tubular screen and the inner ne mesh tubular screen in form.

In case the inner tubular screen I9 isV to be used, this screen in sheet form may be secured along one longitudinal edge thereof to the fine mesh screen and the outer perforated sheet prior to rolling, after which all three sheets may be rolled around the corrugated pipe I5, to thereby form the three tubular screens in one operation, the securing means 25 acting to hold the three screens in form.

in said chamber adapted to engage said seat, said cylindrical pipe having at the lower end portion only thereof adjacent said valve a plurality of perforations', said valve chamber communicating directly with the opening of the lower end of said pipe through said valve seat; a longitudinally corrugated pipe located within said annular drainage space and having alternating hollow ridges and hollow valleys dividing said drainage space into an inner and an outer series of longitudinal drainage channels and provided with perforations establishing communication between said channels and the perforations of the cylindrical pipe and also establishing intercommunication between said channels adapted to7 maintain circulation of drainage water in all channels and to keep said channels clear.

2. In a well point having upper and lower tubular spaced heads, a tubular cylindrical screen located between and concentric with said heads, and a cylindrical pipe located within and spaced from said screen by an annular drainage space and concentric with and connecting said heads, said lower head having a nozzle, a valve seat, a valve chamber below said seat and a valve in said chamber adapted to engage said seat, said cylindrical pipe having at the lower end portion only thereof adjacent said valve a plurality of perforations, said valve chamber communicating directly 'with the opening of the lower end of said pipe through said valve seat; a longitudinally corrugated pipe located within said drainage space and having alternating hollow ridges and hollow valleys dividing said drainage space into an inner and an outer series of longitudinal drainage channels and provided with perforations establishing communication between said channels and the perforations of said cylindrical pipe and also' establishing intercommunication between said channels adapted to maintain circulation of drainage water in all channels and to keep said channels clear, said tubular screen and said corrugated pipe being formed of a single sheet of perforated metal.

'ITMOI'HY G. GRIFFIN. 

